Question about Desa International (R165DT) Utility Heater

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165 heater is making alot of smoke

I have been using my heater for 2 weeks and it is only on the second tankful of fuel. It is producing a lot of smoke when it is running, which it did not do on the first tank of fuel. I am using #2 diesel fuel.

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Smoke is an indication of an improper air/fuel mixture, partially blocked nozzle or blocked air passages.

Kerosene must be atomized and mixed with the right amount of air to burn without smoke and odor.
You should consult your manual to have a guide to resolving the issue.
1. Make sure pump pressure is set accurate (5.6 p.s.i.). The pump controls the air/fuel mixture.
2. remove nozzle and clean with brush and compressed air. Also inspect rear of combustion chamber where air flows into and around the chamber to ensure proper air flow. Any materials that may be bent should be replaced. If not formed properly, the air flow through the heater changes as a result.

Posted on Mar 29, 2009

  • David Hagans
    David Hagans Mar 29, 2009

    diesel will make a noticeable change vs. kerosene, but should not produce smoke unless the fuel is contaminated. Remove the fuel pick-up tube from the tank, place into a clean one quart far of k1 kerosene sitting next to the tank. see if the burn is cleaner with new fuel


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2. restricted fuel filter causing fuel starvation
3. crack in the plastic end cover
4. crack in the airline
5. crack in the fuel line
6. crack in the nozzle adapter
7. water in the fuel
8. Others I’m sure I left out

You must be the one to troubleshoot & find the cause.

Follow these troubleshooting tips

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